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Investment Securities (Investment Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 529,985 | $ 1,074,475
Available-for-sale Securities | 540,239 | 1,074,169
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 330,987 | 674,217
Available-for-sale Securities | 340,194 | 673,886
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 145,405 | 403,227
Available-for-sale Securities | 149,817 | 402,656
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 138,084 | 215,755
Available-for-sale Securities | 141,765 | 216,469
Collateralized Mortgage Backed Securities [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 47,498 | 55,235
Available-for-sale Securities | 48,612 | 54,761
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 1,527 |
Available-for-sale Securities | 1,575 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 905 |
Available-for-sale Securities | 947 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 622 |
Available-for-sale Securities | 628 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 213,520 |
Available-for-sale Securities | 219,244 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 108,476 |
Available-for-sale Securities | 112,013 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 65,902 |
Available-for-sale Securities | 67,185 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 39,142 |
Available-for-sale Securities | 40,046 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 115,940 |
Available-for-sale Securities | 119,375 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 36,024 |
Available-for-sale Securities | 36,857 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 71,560 |
Available-for-sale Securities | 73,952 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 8,356 |
Available-for-sale Securities | 8,566 |
Investment Securities |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 198,998 | 400,258
Available-for-sale Securities | 200,045 | 400,283
Investment Securities | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 196,358 | 397,183
Available-for-sale Securities | 197,340 | 397,183
Investment Securities | Obligation of US Government Sponsored Agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 1,796 | 1,967
Available-for-sale Securities | 1,824 | 1,961
Investment Securities | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 844 | 1,108
Available-for-sale Securities | 881 | $ 1,139
Investment Securities | Maturities Due In Less Than One Year [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 186,451 |
Available-for-sale Securities | 187,126 |
Investment Securities | Maturities Due In Less Than One Year [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 186,351 |
Available-for-sale Securities | 187,026 |
Investment Securities | Maturities Due In Less Than One Year [Member] | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 100 |
Available-for-sale Securities | 100 |
Investment Securities | Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 11,803 |
Available-for-sale Securities | 12,138 |
Investment Securities | Maturities Due From One To Five Years [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 10,007 |
Available-for-sale Securities | 10,314 |
Investment Securities | Maturities Due From One To Five Years [Member] | Obligation of US Government Sponsored Agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 1,796 |
Available-for-sale Securities | 1,824 |
Investment Securities | Maturities Due From Five To Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 744 |
Available-for-sale Securities | 781 |
Investment Securities | Maturities Due From Five To Ten Years [Member] | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 744 |
Available-for-sale Securities | $ 781 |

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